Repello is the world's only mouse and rat repeller with proven efficacy.
The world's first scientifically tested mouse and rat repeller
Repello is the only rat and mouse deterrent based on the species' own alarm signals. Developed by Professor Örjan Johansson (LTU) and evaluated in a pilot study by the Swedish University of Agricultural Sciences (SLU).
READ THE FULL STUDY
91%
Fewer rat sightings
In SLU's pilot study, the number of rats recorded dropped drastically when Repello's signal was activated. Activity dropped in some areas by over 90%, even in heavily infested environments.
100%
Deterrent effect
Every time a rat contact was detected, the reaction was the same: the rat stopped, turned around and left the area. No individual ignored the signal - they all fled immediately.
Recognised because it actually works
Other products are criticised for not working. Repello is praised for working in the real world.
Video
More advanced sound than the rat scares currently on the market
The rat scarer that fights rats without killing them
A new approach to tackling the growing rat problem
Keeping pests away without poison
How the technology works
Repello is based on rats' and mice's own warning signals. By recreating the ultrasonic patterns that rodents associate with danger, Repello creates an environment they instinctively avoid. The method is patented, tested in real homes and completely safe for people and pets.
Rat alarms with ultrasound
Rats use a specific tooth squeak to signal danger to others in the group. This sound is in the ultrasonic range and triggers immediate vigilance and flight.
Repello recreates the alarm signal
The technology is based on patented sound patterns that mimic the rat's own warning signals. The frequencies change continuously so that rodents cannot get used to them.
Rodents leave the area immediately
When the signals are activated, rats and mice perceive the space as dangerous. This causes them to move quickly and avoid the area even after the sound is switched off.
Nyheter
How to recognise a fake scare - the professor reveals the warning signs
Ultrasonic Rat repellers have been on the market for over forty years. But despite hundreds of models and thousands of promises, only one product - Repello - has been scientifically tested and show...
Råttskrämma bäst i test 2025: Repello tar hem dubbla förstaplatser
I två helt oberoende tester under 2025 — genomförda av Villanytt och Bäst i Test Guiden — utsågs den svenskutvecklade råttskrämmaren Repello till årets vinnare. Det gör Repello till den enda råttsk...
Repello launches campaign with Pernilla Wahlgren and Christina Schollin
Pernilla Wahlgren will be the face of the Swedish-developed innovation Repello, which is based on research from Luleå University of Technology (LTU) and the Swedish University of Agricultural Scien...